The following conclusions are based on an analysis of the data col- 

 lected during the 1964 preseason surveys and the regular 1964 sea- 

 sonal flights: 



1. Bergs located in the Labrador-Baffinland Current system between 

 58° N. and Cape Christian, Baffin Island during early December are 

 normally likely to be a factor in next spring's Grand Banks ice season. 

 Small bergs located offshore south of 58° N. in early December are 

 normally unable to survive to the Grand Banks. The main reason 

 for the latter is that the bergs south of 58° N. in December will most 

 likely be traveling in open water and cannot normally survive unless 

 the pack ice overtakes them. Solid medium and large bergs south of 

 58° N. in early December stand a chance of making it to the Grand 

 Banks especially if they are close alongshore and are delayed suffi- 

 ciently to allow the protective pack ice to envelop them before the 

 end of January. There are two additional possible significant sources 

 of bergs in early December from outside the normal current system, 

 namely, Hudson Strait and the area north of Cape Dyer and east of 

 the survey area in Davis Strait and Baffin Bay. It is possible that 

 bergs located in Hudson Strait to the west of the survey area can be 

 returned to the main current system if westerly winds predominate 

 from December to March and other conditions are favorable. It is 

 known that many bergs can enter northern Hudson Strait inside of 

 Resolution Island. There is no evidence that these bergs will normally 

 exit Hudson Strait in the southern entrance north of Button Island. 

 Taking all known and assumed factors into account, it is concluded 

 that the 1964 berg crop traveled in the current system from off south- 

 east Baffin Island directly across the Hudson Strait entrance to off 

 Cape Chidley, Labrador without taking any detour into Hudson Strait. 

 This was also true in 1963. However, Hudson Strait must be con- 

 sidered a possible permanent trap for a large portion of a given year's 

 crop and it also must be considered as a possible temporary trap and 

 therefore a possible significant source of icebergs from December- 

 February. The 1964 preseason surveys extended only to Cape Dyer 

 and no substantial conclusions can be made regarding the possible 

 source of supply into the Baffinland Current between Cape Dyer and 

 Cape Christian from the east, i.e., the glaciers from Disko Bay to 

 Upernavik. Nevertheless, feeling is very strong that this source may 

 be quite significant up until January especially if w^inds from the east 

 to north quadrant have prevailed since late summer. Winds were 

 evaluated as very favorable for drift toward the Grand Banks for the 

 first half of the 1964 berg crop and slightly favorable for the second 

 half of the crop. See table III, and figures 54-61. The winds for 

 the 1964 berg crop overall were estimated to be slightly more favorable 

 than normal for berg drift toward the Grand Banks. 



77 



